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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a14010f60c1a4ab37fd0a56afbe9b81fa3848211bad0941fee64d7d6c905e68' 
  AND token = 'fa6SgeZODOwLtZ+x7qKb+Hr21mKPbqNK8JONeD9/24U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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