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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d1ddb7d3d8992cf8bb55e6e40eb9b106b4a7e7cbf5b54a448acf262d3b0b8d' 
  AND token = 'xQISMOnhDN6cMqYmydIOZFSHFdO29bpVxbE86QCLup0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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