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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8696b9118ff8a7627eff3edb15d3a1865141c81ce1a05df4d8acf6dc37664fc4' 
  AND token = 'ca/fF4DHRSat55ybEMtZnMe/vBuVP7QRfesoK796y/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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