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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1ea7f98ff2bd87154962ba3008f8cf53d1b5dd574e0a20a73282eea14872d3' 
  AND token = 'ouYUn/JAFjBMASxQAsRiUZHc8+DEc+ZvCyXeuMkEioQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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