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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606886701069cb5d1a83e371e3d3e723ecb1d2066e4b62e9af8c74f918f7aa27' 
  AND token = 'LPswprr6WS9iAsfiBbrS9Ufi4pFLtyhu+WGORggGDOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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