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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39789e63189379a5a470cdf98b161c726ab4f3b4d5b0584078e7a58ef787ba9a' 
  AND token = 'h0WM1l9bn6XzNuzLPxBa0rUifXLpGYSYwigyB5cj224=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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