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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360e17373752754d98dfadad859c6f621765d0fd32c9ff2865a38370134fbdff' 
  AND token = '8dm/0ZbXwQVW/tX/A4M3RACV3GBBTPIVXirLbf3vWo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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