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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd538cea4b184d75b4b51811fefa51641b8178d672af6f9d28fbd3c680c15e232' 
  AND token = 'bM1pB5shn6TTENgt2soVKP9yGbUPdGg9zq1IlIb7VoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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