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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d191eb3f4fd6b9b1f3167a73e569c0150b79e0121db9a5f3146f33bba88020a' 
  AND token = 'V/UJXUdUJrBaodk3E0rC6KpIbUxMjnJb+TFdIkoXfK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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