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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb2e8558be39500b3bf4478c18697960ec53b0c5752e7a441ae79d8b7629bca' 
  AND token = 'XdTjanCucy0v3DCPqvT71uKuXTJXN3gxreQlCCP1qWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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