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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c06882674cd3e9e20b797359e737f67ec147c34ecd4fb0bd929a9f73c96247a' 
  AND token = 'XgjXXOupFxpwOEnMfEJotE+JUK6PJTA17YUK36kUN3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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