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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7187c302c23c85db75bea0f740f6b9bc123ea82074342f9f3026e52ad537f3' 
  AND token = 'ZekUVX+1AAARsgQeXvc5bbc4lJzGQv5Wd3EbUoWfxzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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