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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd18e3a3c2fc0dd83792f04157b6ece4824a3467ccc379ebc08770ceaf09f96' 
  AND token = 'B4W13mzEFfF2QxPSQYxhk9CshvbLWyscCGQFs3rr4fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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