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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f78b113dae3783f3cef2ac88fb58078f88a4d09c12a427917e2bd7d737739f' 
  AND token = 'cw8RFkSWJ7vJI5p1QrgTOoS2qAgJZ1Zd+DSalHr0zvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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