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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817235901c374c9cc5e438b2d8ef7c47161c24bf92e2297839791794fdf61ac7' 
  AND token = '2P+TSYeSBvKF2G4oFphRDMEUAHBOMOfHO2Vfve2h5/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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