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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e139ea3001a94156328c34285f5208e20657d3a59918a8fdef236fd2f7ce406' 
  AND token = 'CZkI8YTBuJu7Me3rLIea2XgKau6rEkbl7mBEJdHh3vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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