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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692d158623f8dba01504df8c377cdb32a33e3a0e45086e96d191df39afb178cd' 
  AND token = 'EMSXZSLlymgglhPZuAMIgJQhNc5aCgmEwA9O5VI/aZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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