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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503c7d9426f33b929ca16939ae4c241e8fe8422ea9ac2bb9ec0861e32e078d2b' 
  AND token = 'u6XqV3FP+svr3JbhDVYRDGmvOjybpnD3nrCpiEaqFYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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