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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da720b9d37f81ff494e17a973533808692008d0d6cab92e3aab03540c1bea2e7' 
  AND token = 'h8e1plZBgv0/fXTwOY+tIaNdY28bHKjGBiHedubzd2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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