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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68516f4c225b410cdb50fc11d1028873967194fc9a99626cb1d0cc6e348e6f61' 
  AND token = 'J37UOfPc2aFzAdTFfZAuX6wGNdlpCeuIyfyXPUUJ/4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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