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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e810c690560905e69a4dff7102d3731152b207d16e1f74279ad12e899359ba0' 
  AND token = 'cbxj2qN0zJvakRcrZ8fm1Ky57mNwinCWBcgb0WLGQPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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