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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a404d726229c9ba439bb9bd699b24c5289c145d4389ec310b3aaa394339cd3e4' 
  AND token = 'G4JMXKGckBUjfp250NMh9qTPU2mxGVzAAyAt3lnPHs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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