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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db7655736aefe071ee1a052bfe0d8b58ecd0defb0a4865e7b04e3c4f3a75c3e' 
  AND token = 'HYRRpVp1r25mBiKbVq1xT62mNSpeRh1Y/WVZURbivj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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