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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5877c8ef569ee25311d7a4e9441192ce04a34362d670f83df73e5d0671448ee' 
  AND token = '1HrdL0IQ1shdjV1XZnggoUIJxGU/CJ0TSTlpSppcftA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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