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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fe361953baebfdf9654e5d4b2cb6e7b5690651175d7a952cb9c9c1f23f94fb' 
  AND token = 'T6ypvwjmQMuHzprwmHIAVg31N51duA8jpKHZu0TV8dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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