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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ffdbbe30a92da10eefaa771d6673c797e46b3ed5e4d75f13dcc4880f98035c' 
  AND token = 'cvS9byQMIymWGTIzoPXxx9KB0DasBiF2QlH/ldNXcKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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