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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a702886b84a1f186254bb2df228e8f1413ece3b25cf841909fcb79ce5f6aabc0' 
  AND token = 'WNXFL0mgFBWP0xoH9THI0FJAW03/eihx2Z3/gbKk14M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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