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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531e2d2dd963f3a661aefb42e7a1b47cd7b0eb5685e3fba23c177a23a0afff43' 
  AND token = 'e22xiQB9iDyl9ChEmGoMVby4TqI7Sy5+YcYeVpP4rsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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