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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08549f5d489741d6e27c46d40c89fe34a852a50354998cade9eb114b771ef8f' 
  AND token = 'FNWbjl8sSWimYr1hrk1QXV12B3blKZkA8ImktgcpzEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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