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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc9408c7b8818cf9b839316488a2d69e6de0ac1e4dbff5096e6df79ca49e5fc' 
  AND token = 'iYa7di/kTEyLOqWN4+4HHWRufyoMPt3d6q1dHJf0R1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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