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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed89d751ac60dfb39f7be9da7ca22232ec0e1f2e472f67daf7748ae89dcbf07' 
  AND token = '1YYxBCFmK+056o+PjnvHAG7PF4RqbWVoEA5PEz+sKQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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