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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca545413f9e82871bbeebfefb9e718b76dd4894e24b56fd88fca573864a96c3' 
  AND token = '1tyevhsv+nSpYOh+2Ht8dMI3YjpTu6tiysMmDRQjGe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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