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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d100f66c762707d1d2c49c7adc00df9409a82d03dafc0ad8759e0c42d2cb74c' 
  AND token = 'MTPIuoO/mvX0WfdEY5vXdDumv4u2E9De08QP3umaBGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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