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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eda4760b5924aed4c3da857d2599ee2004ef4c9dc7d8edd1fc6276e19a26ec' 
  AND token = 'rcu6HyckVVfusUehimzmt+S/btViRWIQ3L8LoimIl2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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