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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39883ea7ec37dbf309723aaf124cc0bfb69bb79bd45bc3033ad35e26905b65ab' 
  AND token = 'cC1HYK7gZ2x7hqG6TkRyeV/MM39rfXCXGM0IEdcxM44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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