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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfbad9aa90443c90ac7d40906fa5bf1ece6a1304a8f35c8734f24ff2ee939fb' 
  AND token = 'MjgH9A3b5G1D0w8CrsQwJMX+lhksslfSFq+XakYH/V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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