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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d75ffdc0e3287f7610e28145ace8c3a63d049b75138a752b41e5c66c905878f' 
  AND token = '1L6dR+dH7r48hdRiEUhWUSvtrhtuzdXAgOtdQhjmNY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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