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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c723b098221944e789d5a12a3dbeaf9434ae2a1caef86a364b5f3c6652fe19bb' 
  AND token = 'TgCq+RpqtSmZTMuvmMhtDbse0t+jDTP9qBFRPAp3RdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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