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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cf799d70980c0fef1395dcae68b86bdb7c34d9e6541ffe095bbc40bfc1b6d0' 
  AND token = '938IVvcBsEsG3BsM097yqUiPeINBztEdd2IlJGITqlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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