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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7512d625dabe551dd0f7da72eb6deb1c7c364ba6f5eca1377bd05a939f596bc9' 
  AND token = 'kLflNoEWnOhm34H2dmHlrdYOr3NzkBGdMMfRI5qe6jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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