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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc0e608857ace9177b5ee8ad49897fd2eccada052c8a2e315cc0bfdca793fe2' 
  AND token = 'dcHvJOiPto8iIuGoN5lu8O6B8AmlElNTvXMosHbkH6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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