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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fe1018398e604c06c15ca3103616f48256fa15410977657afbcefdf44dfc13' 
  AND token = 'aIp+z2fOJRWbbrq3g1R2JTrWX4WZFh04xI0MgJqmlfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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