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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f2c8a2230fca8dcdcc4a5eed57b18631d6dd4d3d87c4838f89fbb0f722f7b8' 
  AND token = 'ezbqlsrBaiskVx72KOiVmfT4FjxaGSMO8XBKngueXTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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