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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7152aceecbfef11313e5b77e898e0bceac4bdec35c51edf5d33ecbdaa63c91' 
  AND token = 'RHQLzFVdK9UU+XL/si54hBiVB/RNJV8kdWVP+h9w/5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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