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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bf20bc2e83dad996dba3fd78d230c796893cf1dbfd9cf0e736c94c986a51b9' 
  AND token = 'MxOP6uShD9v8q4msa0FCCp/eH2f0vFwUPiWskctq5AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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