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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a71e2be72645f9dc045a8671e9c9af2f0b1f98b21076f91d7cf33951d05c7f2' 
  AND token = 'NRQeq1ZG9rdAimZWg2qNFTmWZ98/rUlEoIEctLoOVyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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