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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e173fdd2e26b1ac72c620c05156b2bff261084be10e876d9c6dd677c9d99e242' 
  AND token = 'Z4utb3r4OB6am9TmgBWe5MgcTHZNLTQtTbzQOaSpaCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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