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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e1302b499c7b9e90a9bc73f0676f70e210e6a6e4c92448c94f047082502aa0' 
  AND token = '/319YHSQCR9JzFd6g9ryBZv+5L/ZDN9/GPUriF5TFtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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