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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528d314437d98f67ba0bb1d710275e610e9adbd86189e4740d20424f8e35e0f2' 
  AND token = '79e3I+AhMU5P+SwgCINp6igfQ/M7Wn2jGnEUoyRi2hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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