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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047d4f04e92c96c7da3b03e72babacb165603d1e193049685b3cef3a21a779a6' 
  AND token = 'Hh1czAY+SNJgu/ksLKnABRunbH8lnwDc3a9QXg5r3Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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