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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1893ffb192c1e0e201c3ab011e17efdcba507a995d3f03728d294fdf534cf3' 
  AND token = 'KW6WB7pjyrbDDkImgVLahzf2y+t8G12AWs+BB1EX8ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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