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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeab0a7ceac50919261d76cc8e0b20732cd3e985bc56fe37d1328eb79468efb3' 
  AND token = '2XrU6KBeJOIQkOm2nQW0eBlFV2n3vYuW03BlrihMZhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}