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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d1f3138fd6a9caaacad4413646fc3e90d5c911165c4fb80db39d34b93b9986' 
  AND token = 'Ev3gMGQje6qxs/ERWdYDDlhT039fJa0COiIErwkIQu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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