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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b068d0e35ecfdcf4710de83d88ad7eeee34d0bb2d1e3d0a9ee4a170011a760f9' 
  AND token = 'rc4A/Y5vnay9wY9fHeBuvmNni7900zY6Xklpk5wL3wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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