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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf1f4001a88bfec8339f9cce12a9131af751c8b9d611cf60cdba0d0385f9736' 
  AND token = 'D8cX+TRXek+edj8THpBzNRAJfPTCriYsOvtkCTX0CJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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