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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea82d74771e27d8595b8e17f7e2df5c94e697b37e7dabf05a1523c413963e5ea' 
  AND token = 'wnmA5+Xv+rvelvhnPvGUcYq0nuORYzA6n4UMfg+rA5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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