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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5e5995f2f4f730b9982ebf355d33cc9d9e1754cdbd932842384d280e3556d0' 
  AND token = '3QCaRuU7kKWqzCN2g2ltABFEmQI2gK959oSOhBwXUt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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