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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135b3d03264d7fda9ce0cb0a135ebd694fd6e74b58946c9476cd6a381235b066' 
  AND token = 'VR1xJhRZE4NSAE+Hu15/VkCOMCgekMYb6ahyK9SAYuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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