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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cff5e98f4b54b15ea31467df3f9f42d2f47ed963b652a46b8102eb02ac0d57' 
  AND token = '4ekd2fFQR9amDaAMiILfYZzOqPDtcq2vA0bIgRX9MXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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