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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b23cd0e1e7add8fa5108f2b52f513006ba40250061c9cf6a2b52b1a4d04593' 
  AND token = '3Pa2kf/gyn/XfojJyy380693gzWdDA4gojQfFkqh5BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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